This issue can be reproduced with #any LTI configured at the site level#. The key elements is that custom parameters are not saved when a tool is selected in the list of available tools. The steps here use a test application that sets those custom parameters using deep linking. pre-requisite Install ngrok to expose your moodle setup externally. Refer here for additional guidelines Have a course with an instructor. As admin install the LTI Robotest test app using the instructions found at https://robotest.theedtech.dev Tool configuration usage: Show in activity chooser and as preconfigured tool Test: custom parameters and url are saved when adding links using deep linking Enter a course as instructor Turn editing on Add external activity, choose Robotest app Enter Tool URL:  https://robotest.theedtech.dev/deeplink?p1=rl73403 Enter Custom Parameter: resource_id=rl73403 Save and Return to Course Edit the created activity and verify: The tool url is https://robotest.theedtech.dev/deeplink?p1=rl73403 The custom parameter is: resource_id=rl73403  Test: deep link for restricted user Here we want to test deep link flow is functioning despite the url and parameters field not on the displayed form. Create a teacher role without the capability #mod/lti:addmanualinstance (see MDL-62815 )# Create a teacher with that restricted role and enroll it in a course Enter ## that course Turn editing on Add activity Select Robotest Verify the tool url input field is not visible on the page Select Content and choose a non graded item When the modal closes, click save and display Verify the test says success (url passed, params passed)