mekkablue 'Steal kerning from inDesign' stopped working

Hi, I am having an issue with mekkablue ‘Steal kerning from inDesign’ which I have used in the past, but has now stopped working.

Dialogue boxes says “Font activation timed out”
Macro panel: ‘Kernstealer’ was not activated in InDesign within 30 seconds.
Glyphs3 version 3.4.1 (3436)
Indesign 21.3