Error - We were unable to complete the license activation

After upgrading to new macOs Catalina 10.15 it seems that my license got mangled.
I tried reactivating, but that did not work with the above message.
Please tell me what I can do to fix it.

I have a license for TaskPaper 3. I can give the specifics but I’d rather not on a forum.

Please email me ( your license and I’ll get it fixed.

Have send them