Feedbin credentials expire silently

[ChrisHardie]

I'm using NNW 6.1.4 on iOS 17.3.1 with Feedbin. Every few weeks I notice that there are no new feed items coming in. When I pull down to do a hard refresh, I get a notice that the Feedbin credentials need to be re-entered, and when I do, things start working again.

My expected behavior would be to have the Feedbin auth tokens automatically refresh in the background, and if that's not possible, an in-app notice as soon as NNW can no longer sync to Feedbin because of a credentials issue. Thanks.