If you performed a customer-managed account failover to recover from an outage for your GRS or RA-GRS account, the account becomes locally redundant (LRS) in the new primary region after the failover. Conversion to ZRS or GZRS for an LRS account resulting from a failover isn't supported, even for so-called failback operations. For example, if you perform an account failover from RA-GRS to LRS in the secondary region, and then configure it again as RA-GRS, it remains LRS in the new secondary region (the original primary). If you then perform another account failover to failback to the original primary region, it remains LRS again in the original primary. In this case, you can't perform a conversion to ZRS, GZRS, or RA-GZRS in the primary region. Instead, perform a manual migration to add zone-redundancy.
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