Hi @Amy Jandreau ,
Thanks for your posting.
The SSAS connectivity issue can be cause by several reasons.
1.Have you right click your solution to check the target server name? Please refer to below shotscreen:
2.Make sure the TCP has been enabled and the port is open in the firewall. Default instance listens to TCP port 2383. If the client does not use a port number or an instance name, and it is TCP connection, the client will try reach TCP port 2383. The best way to test if this port is open is to use telnet.
3.Make sure there haven't any antivirus software block your connection.
4.Try to restart servers.
For more information, please refer to Connect to SQL Server Analysis Services.
Best regards,
Carrin
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