When configuring your FlashArray Protection Groups to be used with SRM, please ensure that the Retention Policy is configured to retain at minimum 1 snapshot for 1 day. This is important as the SRA will be leveraging the replication retention policy when taking test, failover and re-protect array based snapshots. For Example:
# purepgroup list --retention
Name Array All For Per Day Days
sn1-405-c12-25:sn1-405-25-prod-pgroup-1 source 1d 4 7
target 2h 1 1