“Missing or invalid site address” error message

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Implementing WordPress Multisite feature using AWS Lightsail (https://docs.aws.amazon.com/en\_us/lightsail/latest/userguide/amazon-lightsail-quick-start-guide-wordpress-multisite.html).

Trying to add second site following this instruction accessed through an AI tool:

Map the Custom Domain in WordPress:

  • Go to My Sites > Network Admin > Sites and Edit the second site.
  • Change the Site Address (URL) to the new domain (e.g., secondsite.com).

The above way not working for me as getting “Missing or invalid site address” error message: https://www.canva.com/design/DAGPCIwJbTA/l1ukU73–LI1zGnrPQSiyQ/edit?utm_content=DAGPCIwJbTA&utm_campaign=designshare&utm_medium=link2&utm_source=sharebutton

Help appreciated.

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