lagamorph: It appears that every time GoG Galaxy attempts to use my npsso PSN logs me out and thus renders the npsso invalid. As soon as I sign back in on my browser then, as expected, my npsso is completely changed as well.

I'm starting to wonder if having 2FA enabled on my PSN account is somehow interfering with the integration. Given PSN's habit for breaches though there's no way I'm going to disable 2FA to actually test that, and certainly no way I'd keep it disabled just to use the integration.

Bustacap: the workaround is only meant for the current witcher 3 deal. its not practical for daily use.
i think some other users have mentioned that you have to disable 2fa for it to work

Bustacap: reposting the newest version of the workaround for better visibility
----------------------

- close GOG Galaxy if it's running at the moment

- log in to the Playstation Store (store.playstation.com) through your browser
(if you were already logged in, log out first, then back in)

- after the login open this link: https://ca.account.sony.com/api/v1/ssocookie

youll get something like: {"npsso":"xxx"}
where xxx is the npsso value

(example of what it should look like: https://abload.de/img/npssomcj9f.png )

- open windows explorer and enter the following into the address bar at the top and press enter
%LocalAppData%\GOG.com\Galaxy\plugins\installed\

( https://abload.de/img/localappdataojjbg.png )

- open the psn_{random number} folder and edit the plugin.py file with your favourite text editor

- go to line 64. it sould look like this:
stored_npsso = stored_credentials.get("npsso") if stored_credentials else None

delete everything on that line after: stored_npsso =
then add your npsso value behind it in quotation marks.

it should look like this:
stored_npsso = "npsso value"

("npsso value" is the value from step 3 and should be a 64 character long text consisting of numbers, lower case letters and upper case letters)
(the quotation marks " " are important!)

(example of what it should look like: https://abload.de/img/plugingrjah.png )

- save the changes made to plugin.py and close the file
- restart GOG Galaxy
- try connecting with PSN again

Bustacap: workaround until they fix it:

- close GOG Galaxy if it's running at the moment

- log in to PSN (store.playstation.com) through your browser
(if you were already logged in, log out first, then back in)

- after the login open this link: https://ca.account.sony.com/api/v1/ssocookie

youll get something like: {"npsso":"xxx"}
where xxx is the npsso value

- open windows explorer and enter the following into the address bar at the top and press enter
%LocalAppData%\GOG.com\Galaxy\plugins\installed\

- open the psn_{random number} folder and edit the plugin.py file with your favourite text editor

- go to line 64. it sould look like this:
stored_npsso = stored_credentials.get("npsso") if stored_credentials else None

delete everything on that line after: stored_npsso =
then add your nppso value behind it in quotation marks.

it should look like this:
stored_npsso = "npsso value"

("npsso value" is the value from step 3 and should be a 64 character long text consisting of numbers, lower case letters and upper case letters)
(the quotation marks " " are important!)

- save the changes made to plugin.py and close the file
- restart GOG Galaxy
- try connecting with PSN again

Bustacap: reposting the newest version of the workaround for better visibility
----------------------

- close GOG Galaxy if it's running at the moment

- log in to the Playstation Store (store.playstation.com) through your browser
(if you were already logged in, log out first, then back in)

- after the login open this link: https://ca.account.sony.com/api/v1/ssocookie

youll get something like: {"npsso":"xxx"}
where xxx is the npsso value

(example of what it should look like: https://abload.de/img/npssomcj9f.png )

- open windows explorer and enter the following into the address bar at the top and press enter
%LocalAppData%\GOG.com\Galaxy\plugins\installed\

( https://abload.de/img/localappdataojjbg.png )

- open the psn_{random number} folder and edit the plugin.py file with your favourite text editor

- go to line 64. it sould look like this:
stored_npsso = stored_credentials.get("npsso") if stored_credentials else None

delete everything on that line after: stored_npsso =
then add your npsso value behind it in quotation marks.

it should look like this:
stored_npsso = "npsso value"

("npsso value" is the value from step 3 and should be a 64 character long text consisting of numbers, lower case letters and upper case letters)
(the quotation marks " " are important!)

(example of what it should look like: https://abload.de/img/plugingrjah.png )

- save the changes made to plugin.py and close the file
- restart GOG Galaxy
- try connecting with PSN again

SnowBloodWolf: the first link show me a error not what i'm supose to see

edit : i haven't seen your replies god i don't like forums X)

it worked for the link thx

edit 2 : i'm connected :)