@rlw4cisco - No, actually the value is the same as what is defined in Meraki Dashboard under Organization/Settings/Authentication/SSO Subdomain.Screenshots below for reference:Meraki screenshot:Entra ID screenshot:

As @craig5258 mentions...Updating the Identifier (Entity ID) for the Meraki App in Entra ID from the default value of https://dashboard.meraki.com to https://[organisation].sso.meraki.com resolved SP-Initiated access for me. Thanks!!!