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IronFox (Mull fork) now has an F-Droid repo
(fdroid.ironfoxoss.org)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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I think I figured it out. I just ran into that issue on my tablet, and noticed I had the old C# version of Bitwarden (https://github.com/bitwarden/mobile) installed there instead of the newer native version (https://github.com/bitwarden/android) that I have on my phone. After uninstalling and then installing the native version, it works with IronFox properly.
Oh, I hadn't noticed there was a difference. I re-insatlled, and Bitwarden now has the newer more modern look and all. In the meantime I have switched to Fennec, but might give IronFox another try now.