It looks like I've got a lengthy and detailed explanation of the UEFA Nations League promotion/playoff situations for each league. Here's a concise summary:
League A (Sovereign Teams)
- Norway (13) and Austria (11) are promoted to UEFA Euro 2024
- Wales will face Iceland in a relegation playoff
- Turkey will compete with Wales' result in the group against Montenegro
- Sweden, Slovakia, and Romania have a good chance of getting a World Cup playoff spot
League B
- Norway is effectively guaranteed promotion after their 5-0 win over Kazakhstan
- Austria and Slovenia face promotion/relegation playoffs
- Turkey must win away to Montenegro and Wales needs a specific score margin in Cardiff to take top spot in the group
League C
- North Macedonia are on course for a World Cup playoff spot
- Armenia has earned a promotion playoff spot with their final-day wins over Latvia and Faroe Islands
League D
- Liechtenstein will face San Marino in a relegation playoff determination match after Gibraltar was denied promotion by a late equalizer against San Marino.
- Gibraltar and San Marino are entered into the promotion/relegation playoffs