TM backups to password protected Airport disk

I had trouble getting the following configuration working:
TM backups
to an Airport disk
with the Disk Password (as opposed to Airport password) option
of two Macs (iMac and UMBP)
When I went from Airport PW to Disk PW, the Mac I ran Airport Utility on worked fine, the other got a Backup Disk No Available error. Yes, I deleted the TM plist and restarted.
When I went back to Airport PW, the Mac I did it from worked fine, the other required a combination of mounting/unmounting the disk, restarts, plist deletion, and changing of the backup disk in TM Preferences, but eventually it worked.
The first case (Disk PW) never worked for both machines.
Has it worked for anyone?

Yes, USB connected to Airport Extreme.
Drive is formatted correctly and worked for 2 weeks. Problem came when I tried to switch from Airport PW to disk PW. I did this from the UMBP and I could not get the iMac to work, kept saying "Disk is not available." Tried deleting TM plist, tried restarting, tried manually mounting drive and sparse image.
When I went back to Airport PW, did so from iMac, then could not get UMBP to work, same Not Available error. After restarting, deleting plist, mounting/unmounting, and some other unremembering things, it is now working again.

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