This may be a bug with my mod or a bug with realms I'm not sure. 

So correct me if I'm wrong but any mod will work, on realms, if the mod does not require experimental game to be turned on.
My resource and my behavior packs are dependent packs. Is this a problem?

If my mod is not the problem here is what is happening. The mod works perfectly in a game that is not realms. It does not need experimental game play. It adds 5 entities with custom/edited textures and models. It has unique UUID's and they are dependent of each other. 

I've followed the information on https://help.minecraft.net/hc/en-us/articles/360034973952-Add-ons-FAQ with no success.

When loading into realms you cannot spawn them with eggs or with commands.
The eggs are not in the creative menu.

If I make a world with the mods working then try to replace the order of events is:
1. Exporting 
2. Exporting successful
3. Importing
4. Failed: An error occured
No other info is displayed. No Error code or anything, not even the drop down you get when an addon does not import correctly. The word "occurred" is misspelled in this error message. If that even helps lol

The mod that doesn't work: 
http://www.mediafire.com/file/hs59ptaffb5k8m3/Guards_BP.mcpack/file
http://www.mediafire.com/file/zrp8wx4p4fqw3tj/Guards_RP.mcpack/file 
After trying other mods; some don't even show up in the realms resource and behavior pack menus, but they are there in local games.