This could be related to the version of SQL Server in use
To use Always On with SQL Server, the minimum version needs to be SQL Server Enterprise
SQL Server Standard version will not allow to setup the Secondary Replica access for Read which will prevent connection
The issue can be tested via a UDL file
Create the UDL file as per process in the link above
This should work on the First Node
If the following error is displayed, please contact your SQL Server Technician to check the Replica setting and SQL Server version
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