It is possible to have two connections in a database?

I have two projects and I want to connect both in a database. DATABASE_URL configured the same in the second application and had the following result "Mysql2 :: Error (Host 'domU-12-31-39-09-CA-01.compute-1.internal' is not allowed to connect to this MySQL server) "

It is possible to have two connections in a database? What do I do?
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