Usually, the process takes no more than 15 minutes but in some cases can take up to 24 hours.
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If the domain is pending for more than 24 hours, it means that the required CNAME record does not exist, or it does not exist for this domain.
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In this case, try to do the following steps:
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- Use a domain (or subdomain) that is not used anywhere else.

- Add CNAME as written in the instructions. (Appoint tab > Settings > Custom domain)