We have a very small team: me, my 2 coworkers who are both my senior by over a decade, a web designer who usually works on marketing material but also does some graphical mock-ups or minor graphical fixes for our front end, and the manager/boss. The daily Scrum stand-up is me and my 2 coworkers. Due to the small scale of our team, we tend to take some liberties with the Agile system, like longer stand-ups with a lot more discussion between the 3 of us to agree on solutions for problems we have.
The situation I have is that, because I'm the only one who is at the office every day and I rarely take more than a day of vacation at a time outside of either holiday season, I'm often the only one at the office for the entire day, sometimes even for an entire week or longer. I'm not just talking about "both my coworkers works remote", I'm talking about "both my coworkers are taking a 2-3 week vacation at overlapping times". During this period, I'm the only person of our team who is present, so I have no one else to do Scrum with.
So far, what I've done during these period is do a Scrum stand-up with either the web designer or the manager. However, because neither of them has the domain knowledge the main Scrum team has, this tends to limit the scale of problem solving during the Scrum. They're also sometimes on vacation during the same period. If I'm truly the only person at the office during those times, pretty much the only thing I do during the Scrum is move items I've finished from "In Progress" to "Testing" and mark half days worked in Jira. I don't have the ability to bounce my progress or ideas off my coworkers.
I'm not sure how to handle this. There are resources on how to handle Scrum in a one person team if there is always only 1 person, but there don't seem to be many resources on how to handle teams where the number of members on a day to day basis varies between 1 and 3. Are there generally accepted ways to handle this particular limitation?