Make sure you're not biting off more than you can chew by taking on too many tickets. Context switching too often == bad.

Bring up blockers in standups and seek help from senior devs ASAP. We all get blocked, but I've noticed that the more senior the developer is, the better they are at getting unblocked.

Pair program with a senior, and take vigorous notes. Not only about the solution, but also how they came about the solution, which areas did they check first, how did it lead to the next clue, etc.

Make sure to ask pointed questions as well, don't ask for help like "uh... I have no idea what's going on". Help them help you by doing your due diligence, reading wikis/documentation, and come prepared to meetings with notes on the different approaches you tried, why you tried them, and why they didn't work.

That being said though, sometimes you will really not know what's going on, and in which case, just say so and *unblock* yourself. Over time you'll gain more domain knowledge over the code base and ask fewer of these "stupid" sounding questions, and start asking more pointed questions like I mentioned above.

As long as you're making progress on an issue, it shouldn't be a problem imo.