Hi
I’d be glad to try to help but you will need to provide much more information before I can even begin trying.
I am not looking at your screen. I cannot see what you are doing. I don’t know what callout you’re using or how you have configured it. One way I try to help people is by trying to reproduce the error or condition they are seeing, but I can’t do that because you haven’t provided any information to help me.
I don’t know how you generated the encrypted JWT originally. I don’t know what other things you’ve tried, to diagnose this yourself. I don’t know anything about what you’re doing except that there’s an error that tells you “tag mismatch”.
If you provide more information I might be able to help.