I faced similar issues with Postgres linked tables because of different SQL syntax and also poorly implemented translation from IRIS dialect to your linked server dialect. The workaround is to add an instance of EnsLib.SQL.Operation.GenericOperation to your production and to execute SQL queries via ODBC/JDBC bypassing IRIS, something like:

Set operation = ##class(EnsLib.SQL.Operation.GenericOperation).%New("NameOfYourProductionComponent")
#Dim rs as EnsLib.SQL.GatewayResultSet
Set status = operation.Adapter.ExecuteQuery(.rs, "select 1", .args)
While (rs.Next()) {
   ...
}
Do rs.Close()

I believe Spotify exposes a standard OAuth2 endpoint so you can use built-in IRIS classes to deal with tokens (but to be honest the standard library looks overcomplicated so I personally often use the same approach)