Unable to send messages on my Mac but able to sync using iCloud between iPhone & Mac

I changed my AppleID password recently and I am able to see and sync all of my messages from my iPhone and Mac but I am unable to reply to the messages on my Mac and I am unable to change the settings of the delivery and receivable addresses within the iMessage setting.

Here is the example for the first error while sending any message from the Mac:

When going to the settings to change the delivery addresses:

This loading screen keeps appearing and will not stop loading even after quitting the application. Please let me know what I can do, thanks!