Please don't use the previously bookmarked URL. Follow the below Instructions:
1) Clear the cache and delete the cookies from browser and reboot the machine.
2) Login to the URL https://scmpurchasing.att.com and look for the search Function instead of clicking the bookmarked one.

If this is still an issue, please try logging in from a different browser: FireFox, Edge, IE, Chrome etc. until your primary browser has been restored. We hope this information is helpful, if you need additional iSupplier support please click here for further assistance.

Thank you,
iSupplier HELPDESK
MOBILIZING YOUR WORLD