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Why am I receiving a connection pool error when using the On-prem SurePassID Authentication Server and MS SQL?

Set the value for max number of connections in the MFA Server Web Config to a larger value, in this case we set it to 100:  <add key="Connection.Options" value="max pool size=100" /> 

Optionally you can comment out the entry like this:
<!--add key="Connection.Options" value="max pool size=100" /-->