This problem is fixed now by US Garmin support, but i have a same issue with another activity which i can not delete.
The support in France is not able to solve it because they do not have enough rights.
So i sent an e-mail to [email protected] and receive an answer by Support France... It is like ping-pong... See hereunder an extract of my problem and reference of the ticket.
"activity impossible to delete in Garmin Connect << ID de référence : 13954752K0 >> <Q#:1000554>
I've got an issue in Garmin Connect with an activity named “Andrésy sans catégorie” dated on 25 march 2019. I uploaded it manually. As it was not complete, i tried to delete it.
But it is not possible, it always reappears and there is a message on the page "Désolé, cette page présente des problèmes".
I have already opened a ticket and received an answer from Garmin France support but they do not have the possibility to delete the page : connect.garmin.com/.../3495551798
I tchated with Garmin USA support and they told me than they will escalate my request but nothing happens."
IS IT POSSIBLE THAT SOMEONE IN THE USA HANDLE THAT TICKET ?