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I have an on-prem install of SC 9.0.2 with an Always-On AG setup. Whenever I fail the primary, I notice it takes a few minutes for Sitecore to pick it up. In those few minutes, I get a yellow screen of death. The server error is as follows:

The target database, 'Web', is participating in an availability group and is currently not accessible for queries. Either data movement is suspended or the availability replica is not enabled for read access. To allow read-only access to this and other databases in the availability group, enable read access to one or more secondary availability replicas in the group. For more information, see the ALTER AVAILABILITY GROUP statement in SQL Server Books Online.

After some research, I found this KB - https://kb.sitecore.net/articles/423602

It states that Readable/Writable secondaries are not supported. I enabled this feature as a test on the servers and there was zero downtime. So I guess my main question is - does anyone have any information on why this is not supported? Also, has anyone used this configuration and if so were there issues? I am really disappointed that this feature is not supported.

Thanks in advance.

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