Checked my watch-list for Swat and all episodes are there. That being said there is a known issue across other shows where episodes are not playable.
For me I have not managed to watch episodes 21 and 22 of season 1 Swat. But Season 2 is fine.
Hopefully there is a fix coming soon!
Could be worthwhile keeping an eye on this post https://community.nowtv.com/t5/Content-Issues-Missing-Episodes/Law-and-Order-SVU-seasons-8-amp-amp-9-not-playing/m-p/508404#M13322
I got the community manager involved and suggested they could start a new post highlighting any shows that are "broken". That way it'll hopefully stop folk like us posting all over the forum haha.