I don't know if there is a time delay for how long it takes a profile update to be changed on the server. The link in the profile edit updates instantly, but photos I've published on both Google Drive and Microsoft OneDrive are not working for me. So I thought I would try pointing to a permies.com link to see if I get different behavior. I've tested all 4 of the published photo links below in incognito browser windows and they work OK.
Lee's Headshot on Google Drive
https://drive.google.com/file/d/1eEKHKqyb-YU5fjLb8r5we3LuDzFX_1Ey/view?usp=share_link
Lee's SaveSoil background photo on Google Drive
https://drive.google.com/file/d/154Rm4D0tWmjVLgoeZm02Y5sH2MQN5qfM/view?usp=share_link
Lee's Headshot on OneDrive
https://1drv.ms/i/s!Aosi1mF1YKbkhn5QA4s6IdBz3to2?e=eMUegC
Lee's SaveSoil background photo on OneDrive
https://1drv.ms/i/s!Aosi1mF1YKbkhn9N-cRsVVMvl6m8?e=pwE439
Lee's SaveSoil background photo on Google Drive

<-- image link not working
Lee's Headshot on Google Drive

<-- image link not working
Well, I must be doing something wrong but don't see what.
Test Boot Camp icon image here: