BacPac max file size is 200gb, so probably your database is too big. You need to use an alternative backup. see:
https://learn.microsoft.com/en-us/azure/azure-sql/database/database-export?view=azuresql
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When tried to export my database that is in SQL database to bacpac got the errorFailed to export the database: nexxus-oltp-prod. ErrorCode: undefined ErrorMessage: The Export operation failed because database is larger than max supported size.
BacPac max file size is 200gb, so probably your database is too big. You need to use an alternative backup. see:
https://learn.microsoft.com/en-us/azure/azure-sql/database/database-export?view=azuresql