What is actually the mod? Is it a unit, or a screen map, or an icon? Would like to help you but it is hard to do that not knowing more information.

My Mod is a custom campaign(Meaning a Fake, Fictional, creative collection of scenarios.) using only the original content from the game then creating a collection of scenarios and implementing them into a campaign then converted into a mod for others to enjoy, Nothing special about it, just using original content from the game to create a collection of scenarios to create a campaign. If you want to see the content I have for my issue, then you can check out my mod (Gothic War). Just a reminder, It appears that the only issue for my mod is that my mod will not show up in the players campaign. I do have another mod (War of Britannia) but this mod has no known issues so far.
If this isn't the information your not looking for then my apologies, Just correct me on what info you need in order to help me out. Thank you for your time and I hope that we can work this out, if you have any other questions that I can help you so you can help me with this issue, then please let me know. Yet again, Thank you.

You have not a campaign yet, but a list of scenarios. Well in your campaign folder you have scenario files, not the campaign file (file ending .aoe2campaign), you can create a campaign through the campaign editor in your game (in the main menu under editor). Simply add your scenarios to the campaign and rename your campaign. Then paste your campaign file to the campaign folder in the mod folder.

Thank you for the info that I need in order to improve my mods. I will do my best to retrace my steps to find this error and replace this with the proper files in order to have a properly made mod, and I'll use this information for future mods. Thank you and when the mod is fixed I hope that the mod will be a entertaining campaign for you and others to enjoy.