I started a project admin role a few months ago under the impression that my role was created to help manage the workload the current project admin had and the work would be split between the 2 of us.

I started a project admin role a few months ago under the impression that my role was created to help manage the workload the current project admin had and the work would be split between the 2 of us. While I like and get on well with the team, I really don't have enough to keep me occupied. I'm supposed to be doing the same role as my colleague (she's been there 4 years) but I regularly feel like I'm picking up the parts my colleague doesn't want to do, having been told more work is expected and will be split between us yet much of it will go directly to my colleague and I'm not included or communicated with unless it's to do mundane tasks. I feel more like her assistant than an admin in my own right and can only establish myself when she's on leave which can be difficult as I don't have all the information to cover her effectively. She's the main person who has been training me and we share a line manager. I'm not sure how to broach this with our manager without looking like I'm going behind my colleague's back.

None of it is coming from bad intentions especially with Covid still keeping people working from home most of the time, I'm just struggling having enough to do, not being included in communication and having to regularly ask for tasks. On paper, this role is a step up and I took this role to gain experience under the job title but 5 months in, I feel just as stagnant as I did towards the end of my last job.

I go back and forth of wanting to stick it out to see if it'll get better (which I've done at previous roles) or finding a new role that will be more hands on.

I'm still in the probation period and I'm not planning on more than 2 years with the company which is why I'm torn. Any advice would be appreciated!