License alerts in sandbox site
According to &quot;How License Enforcement Works&quot; a subdomain with 'sandbox' should work fine without Craft complaining about your license.


Does it have a dev-sounding subdomain (e.g. ‘craftdemo’, ‘dev’, ‘local’, ‘loc’, ‘qa’, ‘test’, ‘testing’, ‘sandbox’, ‘stage’, ‘staging’, ‘uat’, ‘acc’ or ‘acceptance’)?


Try contacting support thru the Craft control panel about this. If it's not working properly, I think they can at least add your domain to an allowlist.