Hi @MariaJ ,
Welcome to Microsoft Q&A!
When using version downgrade or cross edition deployment rights, the product use rights for the
originally licensed version and edition still apply.
Please get more infromation from Microsoft SQL Server 2019 Licensing guid. 96089-sql-server-2019-licensing-guide.pdf
And also ,you could consult professionals. Please call 1-800-426-9400, Monday to Friday, 6:00 A.M. to 6:00 P.M. (Pacific Time) to directly speak to a Microsoft licensing specialist. For international customers, please use the https://www.microsoft.com/en-us/licensing/worldwide to find contact information. Or you could get help from Volume Licensing Service Center support.
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