If Tireless March is active on your sovereign you can't cast it on anyone else. Not sure if it's a mechanic change (then the tooltip for the spell is wrong) or a bug (with no mechanic change).
This was already the case in FE.
Also: if you cancel Tireless March from the current unit it can't be recast, ever. Not sure if that's intended.
I fixed Tireless March both by updating the description and making sure that if you dispel it you can cast it on a new unit.
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