Amazon Pay V2 Does Not Stay Connected to Amazon

Yesterday, I updated my WC Amazon Pay to the latest version. However, whenever I follow the steps to reconnect to Amazon Pay, it appears to work at first, but after refreshing, it asks me to reconnect again.

I tried different browsers. I tried waiting over 12 hours to try again. I cleared all caches. None of this made a difference.

Here’s a video capture showing it: https://www.dropbox.com/s/mwhhcnl9gb9is8p/20210520-Amazon%20Pay%20V2%20Fail.mp4?dl=0

As you can see, I follow the steps, log in, do the transfer, WC says it works, but after refreshing, it tells me to do it all over again!

The page I need help with: [log in to see the link]