Bringing an Availability Group online after taking it offline

Answer in the following thread says: https://dba.stackexchange.com/questions/278528/activate-service-broker-on-a-database-in-an-availability-group/324386#324386 "You need to set RegisterAllProvidersIP to 0 Thereafter take the availability group offline and bring online again." Is it easy to bring an AG online after taking it offline. Documentation says: After an availability group goes offline, its databases become unavailable to clients and you cannot bring the availability group back online. Therefore, take an availability group offline only to migrate the availability group resources from one WSFC cluster to another.