Settings sync always returns an error

[ButchAnton]

Issue Type: Bug

I enabled the sync settings a few weeks ago. Last week, I think, I began receiving the following error multiple times a day:
Writing login information to the keychain failed with error 'The specified item already exists in the keychain.'.

VS Code version: Code - Insiders 1.44.0-insider (d8e3cca, 2020-04-02T06:40:18.155Z)
OS version: Darwin x64 19.4.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz (16 x 2400)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: enabled webgl2: enabled
Load (avg)	4, 4, 4
Memory (System)	32.00GB (2.65GB free)
Process Argv	-psn_0_1093899
Screen Reader	no
VM	0%

Extensions (76)

Extension	Author (truncated)	Version
Bookmarks	ale	11.0.0
project-manager	ale	10.11.0
arepl	alm	1.0.22
vscode-color	ans	0.4.5
code-gnu-global	aus	0.2.2
vscode-custom-css	be5	3.0.9
color-info	bie	0.5.1
regex	chr	0.2.0
open-html-in-browser	cod	0.1.21
gitignore	cod	0.6.0
vscode-svgviewer	css	2.0.0
jshint	dba	0.10.21
vscode-eslint	dba	2.1.2
vscode-faker	dee	1.3.0
git-extension-pack	don	0.1.3
githistory	don	0.6.3
xml	Dot	2.5.0
gitlens	eam	10.2.1
vscode-html-css	ecm	0.2.3
prettier-vscode	esb	3.20.0
code-runner	for	0.9.17
gc-excelviewer	Gra	2.1.34
todo-tree	Gru	0.0.171
vscode-guid	hea	1.4.19
vscode-emacs	hir	0.1.1
beautify	Hoo	1.5.0
replace-curly-quotes	jin	1.1.0
vscode-peacock	joh	3.6.0
chat	kar	0.33.0
vscode-gutter-preview	kis	0.25.0
git-indicators	lam	2.1.2
MagicPython	mag	1.1.0
rainbow-csv	mec	1.6.0
ui5-explorer	mic	0.4.0
xml-format	mik	1.0.2
vscode-ui5	mil	1.0.2
vscode-clang	mit	0.2.3
prettify-json	moh	0.0.3
vscode-docker	ms-	1.0.0
python	ms-	2020.3.71113
atom-keybindings	ms-	3.0.6
cpptools	ms-	0.27.0
vsliveshare	ms-	1.0.1891
vsliveshare-audio	ms-	0.1.80
vsliveshare-pack	ms-	0.3.4
debugger-for-chrome	msj	4.12.6
color-highlight	nau	2.3.0
vscode-print	pdc	0.7.14
platformio-ide	pla	1.10.0
polacode	pnp	0.3.4
vscode-css-peek	pra	3.0.2
view-in-browser	qin	0.0.5
java	red	0.59.0
vscode-xml	red	0.11.0
vscode-format	rya	0.0.6
nightwatch-js-snippets	san	0.2.0
todotasks	san	0.5.0
code-settings-sync	Sha	3.4.3
vscode-hexdump	sle	1.7.2
guides	spy	0.9.3
python	tht	0.2.3
gitflow	vec	1.2.1
vscodeintellicode	Vis	1.2.6
vscode-java-debug	vsc	0.25.1
vscode-java-dependency	vsc	0.9.0
vscode-java-pack	vsc	0.8.1
vscode-java-test	vsc	0.22.2
vscode-maven	vsc	0.21.2
vscode-icons	vsc	10.0.0
gitblame	wad	3.2.0
quokka-vscode	Wal	1.0.285
vscode-todo-highlight	way	1.0.4
debug	web	0.24.0
change-case	wma	1.0.0
html-css-class-completion	Zig	1.19.0
vscode-open-in-github	ziy	1.3.6

(2 theme extensions excluded)

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Writing login information to the keychain failed with error 'The specified item already exists in the keychain.'. (#94005)

[ButchAnton]

This is a duplicate of #94005, for example.