The reason it's called U23: only three players are allowed to be older than 23 on the field, the rest needs to be under 23.
Reserve teams (U23) in Bundesliga can only advance up to 3. League and this is also the lowest playable league in the game.
Since you aren't seeing any fixtures this means that Gladbach's U23 is playing in a non-playable league. In this case you might as well sell/forget about your U23 team. Promotion into 3. League is calculated by reputation only so it's nothing you could influence in any way.
I got FMRTE for the sole reason to edit the U23's reputation on the day the relegations/promotions are calculated. Sadly, FMRTE crashes when trying to edit this

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