Hi Manish,
Search for delivery with ID value as 3651675.
Either delete the delivery or perform a mass update to modify the foreign key link to 0.
Then you will be bale to delete this account.
Please note that there might be other deliveries linked as well. So you will have to repeat this for all deliveries.
Another option is to disable the external account
Regards,
Vipul
Regards,
Vipul