Well if you officially live in LUX and can prove it I don't see any way rollbit can get through with this.
They only deny players access if they are a resident of the banned countries.
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bump for holydarkness. I don’t see anything about IP address. And you still aren’t understanding the legal term of the word “resident” where the OP may have meant living. Or he may have become a “resident” after playing there.

If you tries to argue that "it talked about territories, not IP", then I would have to reconsider the worth of my past, present, and future conversation with you.
And I'm glad you're talking about me being confused about resident. I wanted to brush over it when you talked about it before, but decided against it. Now that you're talking about it again... are
you sure you're understand the term about "resident" here? Is it perhaps [it actually crosses my mind and I've been really curious] you mixed "resident" with "citizen"?
To make things clear, my understanding about "resident" on this specific matter, as well as what I believe applied by many [if not all] casino is not about people's nationality, it's about where their feet set place when they accessed the casino. Couple of casinos even describes nicely to me that [I don't recall the exact nation each of them gave me, but let's just throw random names and random casino here for illustration purpose] suppose a Londoners plays at Rollbit from his home, this is a violation of ToS. But when that Londoners, someone with UK citizenship, fly to Singapore or to Japan and accessed Rollbit, it's acceptable. Likewise, when a Singaporean or Japanese is on UK soil, they are not allowed to play on Rollbit despite their nationality and/or they're only staying for a short moment that the official rule of a country group them as a tourist instead of a resident.
Thus, OP, a Spanish with LUX residency permit [not Lux citizenship] is allowed to play in LUX. However, the instance he returned to Spain or when he commute to UK, he is not allowed by ToS to play on Rollbit when their feet [or any limbs, really] is on that soil.
This is not just Rollbit. There are past cases about this topic on different casinos, someone with accepted nationality commute to other [restricted] country and they got banned. And if you must know how do I be certain that many casino apply this rule, it's because the first time I learned about this, I actually asked one casino's insight about residency policy for a case with competing casino. They both gave similar explanation for their own rule about territory. And then another casino, just to be sure.
I believe I've made it known on many occasions to many frequent overseer of this board. I can explain in long paragraph about this, the why they do this and all, but I don't think that'll be necessary for now [and certainly won't be necessary if what I feared above is true, that you'll insist IP is not territory]
Now, moving to OP's real situation. He "admitted" to Rollbit that he's a resident of UK, further strengthen with the IP addresses log that place him in UK. Regardless of his true living arrangement [that according to him he's still having Luxembourg as his base], both point open to an interpretation that he lived in UK, he stepped and walked on UK soil, he breathed UK's air, you name it. Again, not necessarily a citizen of UK, he simply only need to stand on UK's soil and accessed Rollbit from his device, and that's a violation of ToS.
This is what we're discussing, this is what we try to help OP to disprove, that despite his IP address said UK and he made a statement that he's a UK resident, he's actually yet to have UK as his base, he's still living in LUX, he only commuted to UK. To disprove his own "admission" of being UK resident [which instantly broke Rollbit's ToS] that I suggested those --check notes-- hell and high water documentation.
Resident is different than citizen. It really doesn't even matter since it all occurred after play. Resident is different than citizen. If you are living somewhere, it doesn't make you a "resident".
Permanent residence (PR) in the UK means that you can live, work and study here indefinitely without the need to apply for a new visa. PR in the UK is also known as Indefinite Leave to Remain (ILR). One of the key requirements for UK PR is, in most cases, you must have continuously resided in the UK for at least 5 years. However, the specific duration required for obtaining UK PR status depends on the type of UK visa you possess. For instances, holders of the Innovator Founder Visa or the Global Talent Visa may be eligible to apply for UK PR (ILR) after just 3 years. The most common immigration routes that qualify for UK residency are as follows:
Family visa: 5 years
Work visa: 5 years
Business visa: 3 to 5 years
Long residence to ILR: 10 years