Decryption fails running iOS 14.2

I am having exactly the same problem and cannot open password protected files either in Word or Excel. Since upgrading to IOS 14.2 I get the Decryption failed (null) message. I have contacted both Apple and Dropbox Support - they both tell me it is not their fault! Where do I go from here to resolve this problem?

It's a bit troubling that Apple just did an iOS update (14.3).  I downloaded it onto both my iPad and iPhone.  But it didn't fix the problem with opening password-protected documents on DropBox.  WTF?  It also makes me wonder whether DropBox communicatred with Apple about the problem.  Aargghhh...  I had expected an update would resolve the issue.  Ah well.  We will continue to have to do the workaround in the meantime.  PLEASE DropBox admin... speak with Apple about the problem!

I also have the same problem, has anyone resolved it?

I have the same issue, did you manage to resolve it?

Since 2 weeks I am no longer able to open excel files (most of them on dropbox from years) protected with password from the mobile app.

Dropbox prompt me the "insert password form", but when type it the result is "decryption failed (null)". The same files are easily accessible and readable both on pcs and macs, with the same password...

How can I solve this matter?

Thank you so much

I have excel on my iphone, but I can't seem to open the protected .xlxs file from dropbox using excel.  How can I do this to avoid the decyrption error?