BitWarden not working on IPhone 15 O.S.17.1

Had LastPass that worked on IPhone12 but then stopped working- kept saying my user name or password were incorrect. Purchased in IPhone 15 Pro and samething happened. Deleted LastPass and downloaded BitWarden. BitWarden works on my android and computer, but on the IPhone15 I get the same error as before- user name or password incorrect. Anybody have any ideas what is going on?

I have iPhone 15 Pro Max with iOS 17.1.1 and it works well so this issue can’t be anything fundamental.
I take it you’re certain your username and password are correct?

Yes, sure of that. Thanks

Just as another data point, running on iPhone 14 Pro with iOS 17.1.1 and no problems. Have not had any issues on iPhone.