Hi @Laurent Davesne,
To help you can you send me a link of one album of each artist for I can check for you.

I'm not sure how I can do this: there is no discography left for the artist, so not sure how I would find a link.

The artist is Jason Isbell and the 400 Unit.

In a browser, some albums are there but not all.

https://deezer.page.link/dQ7Ag6WYWS54PMZs5

This is the link to the artist, no discography in the app, just the top tracks.

https://deezer.page.link/UvMETzQQVnGUSCgJ6

This is an album I downloaded, so I can still access it, but it is no longer in the discography. Neither is this one :

https://deezer.page.link/BSfHXTb78Xa2HuDi7

It might be a regional issue, because I can see their complete discography in the web player in Germany, but have to scroll down to ‘”’Weitere Alben”:

https://www.deezer.com/de/artist/484045

Thank you, but that doesn't help me. What does Weitere Alben mean ? ( I am not German)

It means “More albums” which is the section of an artist discography that resides at the bottom below “Featured in” etc. Here is the full screenshot for that section in English:

I see. I don't get that in the app. Also, some of these are albums, but some are just tracks from the albums. Some albums are also missing.

In the app, there is nothing below "featured in"

It might have to do with their new album that will come out next Friday, so Deezer’s catalog team is already preparing the updated discography in the background. See e.g. their album page on Last.fm:

Weathervanes — Jason Isbell and The 400 Unit | Last.fm

And it’s possible that the Deezer mobile apps do not show the “More albums” section at all, only the web player and desktop app.

Yes, thanks, I know they have a new album coming out, but I'm not sure why it would make their discography disappear several days before.

And yes, the "more albums" is only on the desktop, but even there, the albums are missing (they should be under the "latest release" which is also missing)

Just to let you know this is still not resolved. On the other hand, Spotify has a perfect discography including the latest release...

Hi @Laurent Davesne, 
Happily coming back to you to let you know everything is fine now with the discography for Jason Isbell and the 400 Unit.