If it is localbitcoin wallet then you cant sign message with it and if you are unverified on there then you might be not able to take payment on that. And I think your BTC id has been changed from localbitcoin.

In this case can you sign via any btc wallet or ethereum wallet which you have been used earlier here?

I am surprised you have came here several years ago and asked for loan at the starting of the day!!! Also, noticed there was an exchange post which you mentioned filled already!!