FYI: Starting several days ago, I had an issue using LOTW when using Ham Radio Deluxe for logging. Just found out it was not only me. This is from ARRL LOTW IT office:
Our IT department is aware and has identified the problem
with uploading QSOs from Ham Radio Deluxe to LoTW.
The problem will be resolved by sometime on Monday, July 21, 2025.
Until this problem is resolved, save the QSOs you wish to upload
as an ADI/ADIF file and upload this file directly to LoTW using the TQSL
application.
Steve - AD4K
operating in Madison, VA