Make sure you are generating the simulation files and testbench in Platform Designer?
https://docs.altera.com/r/docs/683609/26.1/quartus-prime-pro-edition-user-guide-platform-designer/generating-simulation-files-for-platform-designer-systems-and-ip-variants
In your testbench folder, you should have sim/mentor/msim_setup.tcl. Open that and you should see a top level template (TOP-LEVEL TEMPLATE - BEGIN/END). Take the template and make a mentor.do file and edit with your files/options. Using this template will make sure all the required libraries are being added (and hopefully fixing your issue)
https://docs.altera.com/r/docs/683870/25.3.1/quartus-prime-pro-edition-user-guide-third-party-simulation/sourcing-questasim-simulator-setup-scripts
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