When using the ADDONADMIN you do not use the developer ID number. Use the 4 letter developer String ID to first make a new database. Afterwards to make a new local ADDON within that database, enter the Authorization string key. which will produce the local add on number. In the Addon code, in the namefix.grc file, you,there, use your longer individual ID number ID and the local AddON number obtained in the ADDONADMIN program.
As a alternate, you can now use the developer web site to obtain local ADDON numbers.
Windows 10 - Visual Studio 2019; ArchiCAD 26