Be radically transparent with your team when you struggle. Tell people when you're stuck, when something is new to you, when you're uncertain of where to go next. And tell them soon.
In my first jobs, I constantly felt like I was "interviewing" for my position even after I started. I thought that if I couldn't do something simple, I wasn't living up to the skill level I had promised them when they hired me. So I would hide the fact that I was struggling. Worse, after 2 days of being stuck on something "simple," I'd feel like I couldn't possibly tell the team--they'd think I'd wasted their time for two days!
The key for me was to simply be transparent. If I was assigned a task that used some technology I'd never seen, I simply told the team upfront "Hey I've never used Vue before. I'm going to read the docs and familiarize myself with the framework, but if this is particularly time-sensitive, should someone else take this ticket or can anyone recommend a better approach than learning Vue from scratch?"
Then, whenever I hit a confusing bit of Vue code that I couldn't decipher in 20 minutes, I'd simply post a link in Slack and ask "Can anyone help me understand what's going on here?" and explain where I was getting confused.
If your team hired a junior, they don't expect you to be a senior. If they see you working, see where you're getting stuck, and see where they can help, things will go much more smoothly. Where conflict occurs is when a junior disappears for 3 days, then shows up with a PR that needs to be redone (speaking as a person who has been that very junior).