Resolved - 23/08/2019:
Thank you for your patience while we've been looking into this.
We have released a fix for the issue and is no longer be an issue. However, should you continue to see this bounced message after today's release at 11:16 BST, please submit a support ticket and we'll be happy to assist you further.
Update - 23/08/2019:
We've been able to identify what is causing the issue and currently adding in a fix. As soon as this has been released, we will let you know.
Again we apologize for any inconvenience that this has caused.
A number of users have reported issues with Google My Business scheduled messages bouncing when an URL has been added to the post.
Users may be receiving the following bounced message:
Enter a valid URL (ex: www.example.com).
We are currently investigating what could be causing this issue and will update you as soon as we can.
We apologize for any inconvenience that this has caused.