For example I needed an enhanced DBS for a job, for which you have to supply a specific set of documents. I had to fill in the details of all adults in my house. Then wait for the DBS form to be accepted (I had no reason to believe it wouldn’t be but even so it was still a relief when it came through) so that I could start the job. I accepted that this was a necessary and important safeguarding task, I didn’t complain. And it has to be renewed regularly.
When I started my current job I had to take in all sorts of forms of ID, GCSE certificates etc.
I wouldn't be able to provide those specific documents now - not passport, not driving licence, not paper bank statements, not paper electricity, gas or council tax bill. I was, fortunately, savvy enough to add my DBS to the update scheme so my employer can just look up the certificate and see there have been no changes.
Exam certificates, my ex burned them to stop me getting a job. I could chuck a load of money at all of the exam boards to search for my records, but it's a lot of money, as is getting a passport. If I weren't already in a job, I just wouldn't be able to do it.
I know I don't have the documents possible to pass an online dole office check as I used to claim years back and it failed, but because I still had a passport at that point, they decided it was probably me in front of them and not anybody else. And as an aside, I only had that because 9 and a half years previously, the headteacher at my kids' school countersigned as a favour despite only being in the role for 6 months (in exchange for me coming in to facilitate a big activity where the booked person had cancelled at the last minute).
I've also had an NHS job offer withdrawn because my previous employer didn't have a company domain for his email, despite having payslips, as it didn't meet their rules for references - and the employer before that didn't count as it was outside their five year cutoff for references.
I did, however, get a job somewhere else. If it were failing to provide information for UC, with no money and no job (and no money to keep the phone and internet going, never mind pay for documentation), it would have been completely different, as you can't just claim from somewhere else instead.