Thank you for letting us know about this issue!
We’ve checked and found that the problem happened because your posting key was changed, so the system couldn’t verify your new key properly.

When the game first loads, it fetches your public posting key from the API and stores it for later verification. However, if your key changes, it was still trying to verify with the old stored public key — which caused the login error.

We’ve now patched the login logic ✅
If the key verification fails, the system will automatically fetch the updated public key from the API and re-verify.

So from now on, even if you change your keys, you should be able to log in without any problem.
Thanks again for reporting this — your feedback really helped us improve the system! 🙏