Fixing LTI v1.1 Broken links with Blackbaord after LTI v1.3 upgrade
Login to Blackboard with your admin account and Go to Administrator Panel > LTI Tool Providers > Manage Placements <your server domain>
Edit the placements (you can identify LTI v1.1 placements by checking campustoolshighered/ltiAction.do? in their URL)
Example reference of LTI v1.1 placement
Update the Target Link URI with the v1.3 Launch URL (You can check the new launch URL In Tk20 under Administration > LTI Tool Provider Setup > LTI Advantage (v1.3) tab under Integration Information section.)
Provide custom parameter value by copying the string after ‘?’ character of target Link URI used in LTI v1.1
Example reference after editing placement
Your existing links should start working after this change.