Cannot login to the ServiceNow Agent application. (Unauthorized Client)Issue <!-- div.margin { padding: 10px 40px 40px 30px; } table.tocTable { border: 1px solid; border-color: #e0e0e0; background-color: #fff; } .title { color: #d1232b; font-weight: normal; font-size: 28px; } h1 { color: #d1232b; font-weight: normal; font-size: 21px; margin-bottom: 5px; border-bottom-width: 2px; border-bottom-style: solid; border-bottom-color: #cccccc; } h2 { color: #646464; font-weight: bold; font-size: 18px; } h3 { color: #000000; font-weight: bold; font-size: 16px; } h4 { color: #666666; font-weight: bold; font-size: 15px; } h5 { color: #000000; font-weight: bold; font-size: 13px; } h6 { color: #000000; font-weight: bold; font-size:14px; } ul, ol { margin-left: 0; list-style-position: outside; } --> Symptoms When attempting to login to the ServiceNow Agent app by typing in the instance name or attempting to login with user credentials. You will either receive a unauthorized_client or oauth error message Release Madrid release Cause Records in the oauth_entity table were not upgraded when the instance was upgraded to Madrid. Resolution Export your existing records found in the oauth_entity table. Download & import the out of box oauth_entity records attached to this knowledge article Picture of error message when attempting to login from the mobile App Picture of out of box oauth_entity records for Madrid