If you are submitting a new package please read the app submission and app requirements pages in the wiki.
Also double-check that your PR is against the new-pr branch.
Please open bugs for packages on their respective repositories you can search for them here: https://github.com/flathub
Please do not open issues requesting packages. As long as a package meets the guidelines above and works it will be generally be accepted. If you want to create a Flatpak see the documentation or join ircs://chat.freenode.net/flatpak for help.