Hey @MortimerCat. Great work and thank you for detailing everything you have done! This may help other neighbors in the future try out these options as well to see if they fix their concern. Bravo indeed!
In regards to additional troubleshooting steps, it looks like you have exhausted nearly everything you can do on your end. If you can, please reach out to our support team here via call so they can work with you on this to help reach a resolution that works. Feel free to come back and let us know what the advanced technical support agents were able to do for you. 