Error: 404: on Salesforce HTTP request

URL: https://tilth.my.salesforce.com/services/data/v50.0/sobjects/Web_Ticket__c/tmp_sf_63d14584a5a5c6.13504890

Message: Provided external ID field does not exist or is not accessible: tmp_sf_63d14584a5a5c6.13504890

Code: 404