G'Day,
Probably nothing.
LOGic uses TQSL and accesses your account on LOTW on your behalf - there is no "magic" in the process. The only things to go wrong happen when ARRL/LOTW make subtle changes to the WEB API to send/receive the ADIF files and LOGic does not see what it expects to see during the process.
But, you can do it all yourself by running the process manually, checking the various files at each step as you go, to see where the problem might be.
To see what is happening - use the buttons to create an ADIF for export, then use TQSL yourself to send the ADIF file to LOTW. Later, manually download the report ADIF from LOTW and use the buttons in LOGic LOTW QSLing to "import from ADIF".
Peter VK4IU
You can help by posting images of
any errors and including your
Logic version.