I had the same problem with the 2024 version of TurboTax online. TTO indicated that I could import my W-2 from Guardian Life Insurance, but when I typed in the control number provided in box D (exactly as it appeared), it would not go through.
This is the error that appeared under the box:
Make sure this info exactly matches what's in box D, including spaces
I tried to get my W-2 another way, but Guardian did not provide a digital W-2 for me to upload, and my iPhone would not cooperate with the "snap a photo" process (despite being relatively new and updated to the latest iOS version). So I went back and entered my W-2 manually, opting not to enter the control number in box D. Everything seemed to go through that time!
Thanks to everyone who contributed to the discussion, but especially @cnb088 and @Whytyis for asking the questions and @AmyC for the most comprehensive answer.
