unable to pair device after removal

[Jn115759]

Hope someone is able to help me with the issue below.
I am succesfully using Zigbee2MQTT in Home Assistant for over 2 years now. Works just great!

Some time ago I had a smart plug (Tuya TS011F_plug_1) removed from my instance.
A few weeks later I wanted to integrated the plug again, but although there was no issue getting the plug into pairing mode, Zigbee2MQTT did not identify the device after pushing the "permit join" button.
After this event, I was able to pair other devices from the same build. My conclusion: there must be something wrong with that specific device.

Any suggestions on how to check the plug is still in good shape?
Suppose I unintentionally used the "block from joining again" switch, Could this then be the reasons? Can this be undone?

Many thanks for every helpfull suggestion.

[Jn115759]

Anyone who could help me with the issue above?
@Koenkk , would appreciate if you could take a look and give some feedback. Many thanks.

[c0mplex1]

Have you checked that the block list is empty?