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If this stopped working only very recently, it could be related to the Chrome’s recent breaking change , that in case cookie’s attribute SameSite is not explicitely set it defaults to SameSite = Lax, which prevents your browser in cross site requests to sent the cookie over.
I checked your https://shop-sandbox.adbuddy.be/discussie/ – there are many cookies with SameSite empty.
There could be a couple of more reasons, why a browser ignores a cookie in the request and I tried to sum all of them in my blog here
Source:stackexchange.com