I have tried restarting the LM, but this did not resolve the issue. When you say to keep only the licenses which are valid, do you mean to delete the invalid license files off the computer, or to delete the invalid portions in the ansyslmd.ini file which currently contains several licenses within it?
Below is the full file from the previous screenshot. The file, generated by the Optics Launcher, was named lisence.lic, and when had uploaded it to the license manager it instructed me to append it to the original license. I do notice now that while not explicitly labeled as disk serial number, the number immediately following the server name does not match the serial number in the original license file. The modified license file (with the below appended onto it) does match the original serial number.
SERVER PHYS-S675 b40ede7021f5 1055
VENDOR ansyslmd
USE_SERVER
# Products licensed in this file:
# 1. Ansys Zemax OpticStudio Enterprise: 1 task(s) Lease expiring 02-Sep-2023 Customer # 1110163948
INCREMENT zos_level1 ansyslmd 9999.9999 02-sep-2023 1 2B1D792D24F6 \
VENDOR_STRING=customer:1110163948 SUPERSEDE \
ISSUER=AUFI_LUM_TRIAL ISSUED=03-aug-2023 START=03-aug-2023 \
SIGN="0060 780D 04B8 5030 86FC CA01 25C7 4300 71F8 7A9F FD75 \
41E0 A65D 8108 CBA0" SIGN2="00E7 15A2 16F2 C7C3 3D72 1C02 8B58 \
E400 EA61 2EDB 3BD2 00F0 E696 8634 7596"
INCREMENT zos_level2 ansyslmd 9999.9999 02-sep-2023 1 EB30A41CD61B \
VENDOR_STRING=customer:1110163948 SUPERSEDE \
ISSUER=AUFI_LUM_TRIAL ISSUED=03-aug-2023 START=03-aug-2023 \
SIGN="001E E2F2 9FB3 96E7 5902 33EB 9124 0200 41CF A6A9 EB01 \
B9BF 3FBE 0A3E 3B1E" SIGN2="0023 DD2C 51D0 3866 5EA5 4866 AC0B \
1D00 41C1 3349 9E27 CBFA 2C0F CDBD 6C96"
INCREMENT zos_level3 ansyslmd 9999.9999 02-sep-2023 1 57194B2CE857 \
VENDOR_STRING=customer:1110163948 SUPERSEDE \
ISSUER=AUFI_LUM_TRIAL ISSUED=03-aug-2023 START=03-aug-2023 \
SIGN="003F 1FFC 3790 669A 5DBA 70CE 5249 9100 6E72 392B DC50 \
3D99 6FB4 C32F 41FA" SIGN2="00ED B487 AAE7 5980 0AA7 0BFB C7AE \
6500 C0E1 1584 BA22 D8BE 8AD1 59F2 D222"