Add Related Website Set for www.teachingtextbooks.com

[SeanGleeson]

The JSON is already live on the primary sites and all the related sites.

[github-actions]

The RWS JSON was not successfully validated. Here are your results:
There is no provided rationale for https://teachingtextbooks.com
The provided primary site is not an eTLD+1: https://www.teachingtextbooks.com
The provided associated site is not an eTLD+1: https://parentportal.teachingtextbooksapp.com
The provided associated site is not an eTLD+1: https://transfer.teachingtextbooks.com
The provided associated site is not an eTLD+1: https://app.teachingtextbooks.com
The provided service site is not an eTLD+1: https://api.teachingtextbooks.com
The provided service site is not an eTLD+1: https://cloud.teachingtextbooks.com
The provided service site is not an eTLD+1: https://research.teachingtextbooksapp.com
The provided service site is not an eTLD+1: https://express.teachingtextbooksapp.com
Experienced an error when trying to access https://parentportal.teachingtextbooksapp.com/.well-known/related-website-set.json; error was: Expecting value: line 1 column 1 (char 0)
Experienced an error when trying to access https://app.teachingtextbooks.com/.well-known/related-website-set.json; error was: Expecting value: line 1 column 1 (char 0)
Experienced an error when trying to access https://api.teachingtextbooks.com/.well-known/related-website-set.json; error was: Expecting value: line 1 column 1 (char 0)
The service site https://api.teachingtextbooks.com does not have an X-Robots-Tag in its header
The service site https://tthq.me does not have an X-Robots-Tag in its header
The service site https://cloud.teachingtextbooks.com does not have an X-Robots-Tag in its header
The service site https://research.teachingtextbooksapp.com does not have an X-Robots-Tag in its header
The service site https://express.teachingtextbooksapp.com does not have an X-Robots-Tag in its header
The service site https://api.teachingtextbooks.com has an ads.txt file, this violates the policies for service sites
The service site https://tthq.me has an ads.txt file, this violates the policies for service sites
The service site https://cloud.teachingtextbooks.com has an ads.txt file, this violates the policies for service sites
The service site must not be an endpoint: https://api.teachingtextbooks.com
The service site must not be an endpoint: https://tthq.me
The service site must not be an endpoint: https://cloud.teachingtextbooks.com
The service site must not be an endpoint: https://research.teachingtextbooksapp.com
The service site must not be an endpoint: https://express.teachingtextbooksapp.com

[SeanGleeson]

OK, I will address these issues and try again another time.