Welcome to the forum @serkef
The earlier thought above was that this could be done entirely server-side, with no Duplicati changes.
This turned out not to be the case, so a new release will be needed with details TBD, but last update:
This likely means the server change was removed until Duplicati change can be released. Tech detail.
Typically a leisurely fix rollout would turn into a Canary release, then Experimental, then finally a Beta.
This time, I’m wondering if it will be done as a hotfix to current Beta, but as I said, the details are TBD.
Meanwhile, the best bet for anyone who has a long lived token in an old job or job export is – use that.
An AuthID can be used for as many backups as you like (provided it’s on the right account, of course).