I have 2 SSRS 2019 servers, and I'm using Report Builder 15 to connect to SSAS over an OLAP https connection. The connection works fine and I'll able to successfully build a report and get results using the Query Designer tool in Report Builder. My issue only occurs when I go to run the report in Report Builder (see errors below). I have TLS 1.2 enforced using the IISCrypto tool and the registry settings to enable TLS 1.2 for .Net are also in place.
An existing connection was forcibly closed by the remote host
Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
The underlying connection was closed: An unexpected error occurred on a send.
The connection either timed out or was lost.