Nominators of Doctor Who, Saga (Comics), Star Trek: Alternate Original Series, Star Trek: Deep Space Nine, Star Trek: Discovery, Star Trek: Voyager – please nominate according to the nominations instructions. Do not use AO3 canonical character tags.

Nominator of Star Wars Expanded Universe – please use either Star Wars New EU - All Media Types, Star Wars Legends - All Media Types, or some more specific subfandom (e.g. Rebels, Clone Wars) for your nomination.

ETA:

Nominator of Crossover Fandom: Supergirl (TV 2015)/Krypton (TV 2017) – please either nominate relationships under Crossover Fandom, or the characters under their respective fandoms.

Issues with individual tags:

DC's Legends of Tomorrow (TV): Character: Amaya Jiwe/Charlie – did you mean to ask for a relationship instead?
Thor (Movies): Relationship: Actor!Loki/Actor!Thor & Loki-as-Odin (Ragnarok) – if I am interpreting this scenario correctly, this would not be allowed under Space Swap's mandate. What are you requesting?

Additionally, AO3 is being annoying and losing the fandom for some tags. If you see your tags down there, please tell which fandom(s) they're supposed to go under.