Had the same problem a few months ago. Tried again the next morning and received the OTP in no time. Rest of the process was quite efficient. See how it goes tomorrow.
Couldn't find mention of this on the forum, and saw a few recommendations for Koss headphones recently, so thought it might be of interest: https://koss.com/blogs/stories/passing-of-john-c-koss
The lightning cable actually has a built in DAC that measures pretty well, so it is still a valid budget option. Obviously, the camera adapter with a better USB DAC would be nice, so it depends on the budget.
Kandi Records offered cleaning. I believe it was a combo of Spin Clean and a vacuum machine. Maybe contact Jacques at Turntableguy, who is taking over Kandi, to check what process they use.
Some My Book Live drives have been reset via malicious remote access:
https://arstechnica.com/gadgets/2021/06/mass-data-wipe-in-my-book-devices-prompts-warning-from-western-digital/
https://community.wd.com/t/action-required-on-my-book-live-and-my-book-live-duo/268147