Hi! @BradJ1,
Have you tried checking with regular ink cartridges does the issue persist?
Mobile hotspot does not have much bandwidth to support printer communication, So it is not recommended to connect your printer using the mobile hotspot.
You can use Instant Ink program by connecting the printer to a hot spot for few days. Such a system should work, however HP can not guarantee the printer will be able to connect to a hot spot or web services.
As a test you can enable web services on your printer through the hot spot. Once done, try sending a printer to the printer's ePrint address. If the printer can print a document that is emailed, you should be able to setup and use Instant Ink.
Refer this article to know more information about instant ink FAQ's. Click Here
Hope this answers your query!
Have a great day! 🙂
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A4Apollo
I am an HP Employee