Odd intermittant error on webhook "[Trigger webhook] Unknown error"

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hi
I have a webhook connected to make, it creates a link to a telegram group my sports club uses for messaging. the make scenario takes an email entered in glide and uses it to verify their member status using an api to our membership system

The make scenario works nicely and the whole process works for me and several of my test users. However one user is having problems. the webhook doesn’t seem to ‘fire’ and make doesn’t register the attempt so i think this is an issue with the glide webhook

this is my webhook

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image945×674 36.7 KB

I get an email confirmation of the same

in my action history i see

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image966×275 19.1 KB

and clicking on the more details box shows

{
   "body":{
        "Name":"correctname",
         "TGID":"@correctID",
         "Email":"correct email",
         "rowID":"oOvmLoVOSjqVfMvFlawE2w"
      },
"endpoint":"https://hook.eu2.make.com/olm8nbca66uondtkbngwhtwh4y66it78"
}

the webhook is correct
the details are correct
the hook isn’t reaching make - it doesn’t appear in the make history for the webhook

any ideas?