It seems to be a variable declaration issue and connectivity issue. I am suspecting this attributed to the warning.
Can the fitter compilation complete without error?-- If Fitter is Passing without error, then you can safely ignore the synthesis warnings.
You may find it useful to run the example design first, check the connection to help understanding and compare with your design.
I am attaching a word document which I centralized all the warnings listed with “CAUSE” and “ACTION” to help handle the warnings.
Hope this helps.
As there has been no update from you recently, I am assuming that the information I provided has helped you to resolve your issue. I now transition this thread to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you.
You can refer to page 28 of this Quartus handbook --> https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/qts/qts_qii5v2.pdf
Please follow the steps provided to assign the Output Enable Group option.