diff --git a/modules/userId/index.js b/modules/userId/index.js
index b0293a9c26a..42fff2cd16c 100644
--- a/modules/userId/index.js
+++ b/modules/userId/index.js
@@ -141,7 +141,7 @@ import { createEidsArray, buildEidPermissions } from './eids.js';
 import { getCoreStorageManager } from '../../src/storageManager.js';
 import {
   getPrebidInternal, isPlainObject, logError, isArray, cyrb53Hash, deepAccess, timestamp, delayExecution, logInfo, isFn,
-  logWarn, isEmptyStr, isNumber
+  logWarn, isEmptyStr, isNumber, isGptPubadsDefined
 } from '../../src/utils.js';
 import includes from 'core-js-pure/features/array/includes.js';
 
@@ -184,6 +184,9 @@ export let syncDelay;
 /** @type {(number|undefined)} */
 export let auctionDelay;
 
+/** @type {(string|undefined)} */
+let ppidSource;
+
 /** @param {Submodule[]} submodules */
 export function setSubmoduleRegistry(submodules) {
   submoduleRegistry = submodules;
@@ -557,6 +560,26 @@ export function requestBidsHook(fn, reqBidsConfigObj) {
   initializeSubmodulesAndExecuteCallbacks(function () {
     // pass available user id data to bid adapters
     addIdDataToAdUnitBids(reqBidsConfigObj.adUnits || getGlobal().adUnits, initializedSubmodules);
+
+    // userSync.ppid should be one of the 'source' values in getUserIdsAsEids() eg pubcid.org or id5-sync.com
+    const matchingUserId = ppidSource && (getUserIdsAsEids() || []).find(userID => userID.source === ppidSource);
+    if (matchingUserId && typeof deepAccess(matchingUserId, 'uids.0.id') === 'string') {
+      const ppidValue = matchingUserId.uids[0].id.replace(/[\W_]/g, '');
+      if (ppidValue.length >= 32 && ppidValue.length <= 150) {
+        if (isGptPubadsDefined()) {
+          window.googletag.pubads().setPublisherProvidedId(ppidValue);
+        } else {
+          window.googletag = window.googletag || {};
+          window.googletag.cmd = window.googletag.cmd || [];
+          window.googletag.cmd.push(function() {
+            window.googletag.pubads().setPublisherProvidedId(ppidValue);
+          });
+        }
+      } else {
+        logWarn(`User ID - Googletag Publisher Provided ID for ${ppidSource} is not between 32 and 150 characters - ${ppidValue}`);
+      }
+    }
+
     // calling fn allows prebid to continue processing
     fn.call(this, reqBidsConfigObj);
   });
@@ -817,6 +840,7 @@ export function attachIdSystem(submodule) {
  * @param {{getConfig:function}} config
  */
 export function init(config) {
+  ppidSource = undefined;
   submodules = [];
   configRegistry = [];
   addedUserIdHook = false;
@@ -839,9 +863,10 @@ export function init(config) {
   }
 
   // listen for config userSyncs to be set
-  config.getConfig(conf => {
+  config.getConfig('userSync', conf => {
     // Note: support for 'usersync' was dropped as part of Prebid.js 4.0
     const userSync = conf.userSync;
+    ppidSource = userSync.ppid;
     if (userSync && userSync.userIds) {
       configRegistry = userSync.userIds;
       syncDelay = isNumber(userSync.syncDelay) ? userSync.syncDelay : DEFAULT_SYNC_DELAY;
diff --git a/test/spec/integration/faker/googletag.js b/test/spec/integration/faker/googletag.js
index 1d1a7512153..a8676b500a5 100644
--- a/test/spec/integration/faker/googletag.js
+++ b/test/spec/integration/faker/googletag.js
@@ -51,9 +51,15 @@ export function enable() {
   window.googletag = {
     _slots: [],
     _callbackMap: {},
+    _ppid: undefined,
+    cmd: [],
     pubads: function () {
       var self = this;
       return {
+        setPublisherProvidedId: function (ppid) {
+          self._ppid = ppid;
+        },
+
         getSlots: function () {
           return self._slots;
         },
diff --git a/test/spec/modules/userId_spec.js b/test/spec/modules/userId_spec.js
index 0190bceca70..29b5aca630e 100644
--- a/test/spec/modules/userId_spec.js
+++ b/test/spec/modules/userId_spec.js
@@ -49,6 +49,7 @@ import {flocIdSubmodule} from 'modules/flocIdSystem.js'
 import {amxIdSubmodule} from '../../../modules/amxIdSystem.js';
 import {akamaiDAPIdSubmodule} from 'modules/akamaiDAPIdSystem.js'
 import {kinessoIdSubmodule} from 'modules/kinessoIdSystem.js'
+import * as mockGpt from '../integration/faker/googletag.js';
 
 let assert = require('chai').assert;
 let expect = require('chai').expect;
@@ -114,15 +115,21 @@ describe('User ID', function () {
 
   describe('Decorate Ad Units', function () {
     beforeEach(function () {
+      // reset mockGpt so nothing else interferes
+      mockGpt.disable();
+      mockGpt.enable();
       coreStorage.setCookie('pubcid', '', EXPIRED_COOKIE_DATE);
       coreStorage.setCookie('pubcid_alt', 'altpubcid200000', (new Date(Date.now() + 5000).toUTCString()));
       sinon.spy(coreStorage, 'setCookie');
+      sinon.stub(utils, 'logWarn');
     });
 
     afterEach(function () {
+      mockGpt.enable();
       $$PREBID_GLOBAL$$.requestBids.removeAll();
       config.resetConfig();
       coreStorage.setCookie.restore();
+      utils.logWarn.restore();
     });
 
     after(function () {
@@ -321,6 +328,50 @@ describe('User ID', function () {
       expect((getGlobal()).getUserIdsAsEids()).to.deep.equal(createEidsArray((getGlobal()).getUserIds()));
     });
 
+    it('should set googletag ppid correctly', function () {
+      let adUnits = [getAdUnitMock()];
+      setSubmoduleRegistry([amxIdSubmodule, sharedIdSystemSubmodule, identityLinkSubmodule]);
+      init(config);
+
+      config.setConfig({
+        userSync: {
+          ppid: 'pubcid.org',
+          userIds: [
+            { name: 'amxId', value: {'amxId': 'amx-id-value-amx-id-value-amx-id-value'} },
+            { name: 'pubCommonId', value: {'pubcid': 'pubCommon-id-value-pubCommon-id-value'} },
+            { name: 'identityLink', value: {'idl_env': 'identityLink-id-value-identityLink-id-value'} },
+          ]
+        }
+      });
+      // before ppid should not be set
+      expect(window.googletag._ppid).to.equal(undefined);
+      requestBidsHook(() => {}, {adUnits});
+      // ppid should have been set without dashes and stuff
+      expect(window.googletag._ppid).to.equal('pubCommonidvaluepubCommonidvalue');
+    });
+
+    it('should log a warning if PPID too big or small', function () {
+      let adUnits = [getAdUnitMock()];
+      setSubmoduleRegistry([sharedIdSystemSubmodule]);
+      init(config);
+
+      config.setConfig({
+        userSync: {
+          ppid: 'pubcid.org',
+          userIds: [
+            { name: 'pubCommonId', value: {'pubcid': 'pubcommonIdValue'} },
+          ]
+        }
+      });
+      // before ppid should not be set
+      expect(window.googletag._ppid).to.equal(undefined);
+      requestBidsHook(() => {}, {adUnits});
+      // ppid should NOT have been set
+      expect(window.googletag._ppid).to.equal(undefined);
+      // a warning should have been emmited
+      expect(utils.logWarn.args[0][0]).to.exist.and.to.contain('User ID - Googletag Publisher Provided ID for pubcid.org is not between 32 and 150 characters - pubcommonIdValue');
+    });
+
     it('pbjs.refreshUserIds refreshes', function() {
       let sandbox = sinon.createSandbox();