You need to create an SAP Cloud ALM Subaccount under SAP BTP.
The reason could be you delete the CALM subaccount occasionally or when you view the service key in Subscriptions and Instance under the subaccount, it opens empty.
SAP Cloud ALM 1.0
subaccount, BTP, Global account, CALM, subscriptions, instance , KBA , SV-CLM-INF-ONB , Onboarding and Decomissioning , How To
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