How to unblock blocked contact from Teams client - "We can't unblock this person at the moment. Try again later."

Error Message -

There are sometimes the internal contact was blocked and we couldn't unblock the blocked contact from Teams client and get the error "We can't unblock this person at the moment. Try again later."

Resolution -

• Open Teams web client through Microsoft Edge browser and sign in into Teams with an affected user account,
• Open Web Developer tools with keyboard "Ctl+Shift+I" and select the "Network" tab
• Switch to Teams UI on the left side of the edge browser and click on the "3-dot-menu" next to the profile picture and select the "Settings" option
• Selecting the "Settings" option will show the "Settings page" on the Teams UI and the Web Developer tools network tab will show multiple events
• Search for the "blocklist" event

• Right-click on the "blocklist" event and select "Edit and Resend"

• On the API URLs select the GET method and type https://teams.microsoft.com/api/mt/part/msft/beta/userSettings/blocklist ,and click "Send".

• You will find all the blocked contacts including PSTN numbers.
• Change the API method to "POST" and change the URL "https://teams.microsoft.com/api/mt/part/msft/beta/userSettings/blocklist/manage".

• Switch from the "Query" to the "Body" tab to modify the body
• paste the following value into the "Body" field

{"remove":["8:orgid:Enter the User GUID you found on the GET result"]}

• Click "Send"
• After sending the request, the response will indicate that the request is "In Progress" and after a few seconds, the blocked user will be removed from the blocked people list.
• On the API URLs select the GET method and type https://teams.microsoft.com/api/mt/part/msft/beta/userSettings/blocklist ,and click "Send" and validate the blocked number is removed.

Remove blocked PSTN Number -

• Follow the same above steps and change the API method to "POST" and update {"remove":["4:6505830586"]} on the body and click "Send".

The change before and after the PSTN removal