Hello, you could try using https://wordpress.org/plugins/bp-disable-activation-reloaded/
If you want to keep the activation email, try an SMTP plugin because the issue is related to php mail. If you do not know about this please contact your hosting support 🙂
Hi there!!! Help others from the community and mark any reply as solution if it solved your question. Mark as a solution
Laura Solanes - Graphic Designer and Web Designer
Please be patient as I try to answer each topic as fast as i can.
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Always happy to help you 🙂