Instead of showing the error nessage "The Dynamics 365 Business Central Server Administration tool can only manage version 13.0. The ServerInstance 'MicrosoftDynamicsNavServer$DynamicsNAV110' is Version '11.0.26401.0'." if you select a Service Tier of another version I suggest just hide the unsupported Service Tier Version from the Dynamics 365 Business Central Server Administration.
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Ideas Administrator

Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future.

Best regards,
Business Central Team