Android Messages has changed its URL to https://messages.google.com/web

Now, it seems like it's redirecting to the new link on its own.
until it will be fixed you can use "_Custom Service".
Name: Android Messages
URL: https://messages.google.com/web
Logo: https://ssl.gstatic.com/images/branding/product/1x/messenger_96dp.png
works for me. hope it will help you too.
Mine redirected to the new URL as well after restarting Rambox. Should still put the new URL into the next release.
Continue the problem in version 0.6.7
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Most helpful comment
until it will be fixed you can use "_Custom Service".
Name: Android Messages
URL: https://messages.google.com/web
Logo: https://ssl.gstatic.com/images/branding/product/1x/messenger_96dp.png
works for me. hope it will help you too.