When installing K2 5.1, you may experience this issue with the following error appearing:
The minimum installation requirements for SQL Azure Database Service Tier is the following:
"Azure SQL S2 is required at a minimum. K2 recommends Azure SQL P1, however this may vary depending on the estimated use."
This warning message will pop-up during your installation and it will not allow you continue any further.
To confirm what Azure SQL Database Service Tier you have on your environment, please refer to this article:
Run this query against your K2 Database:
SELECT slo.service_objective FROM sys.databases d
JOIN sys.database_service_objectives slo
ON d.database_id = slo.database_id;
It will return the relevant Service Tier.
If it returns ElasticPool, it means you are running a basic Service Tier setup. To be on a supported Service Tier, it needs to return a minimum of S2, but a preferred Tier would be P1.