Standard "direct to object storage" buckets work fine with the new switch but when I add a bucket that was used in a SOBR to a sidecar VBR using new -EnableReadOnlyMode, it shows No backups found when you run a rescan. This was the same issue in 12.x when using read only or read write keys. The fix was to run Import Backups which would then find the backups, but in 13.1 with the new switch, the Import Backups returns error:
"Failed : Infrastructure item save failed Error: "Failed : Repository does not support repository level encryption Agent failed to process method {Cloud.FindRepositoryKey}."
You may be hitting this limitation. However, please wait for the conclusion to the Support Case as per the forum rules. Only once your support case is complete and you have questions on the conclusion, then post.
David Domask | Product Management: Principal Analyst