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I purchased two license for sendy and I changed the domain for one license and it ran well for 2-3 days and now when i log into it said that I need to buy custom domain license, even though i am using the same domain and not using any other domain apart from the license domain.
please look into it as soon as possible.
If you get a 'Unlicensed custom domains' error, this is an issue with your license key that's stored in the database being invalid.