Colleagues complained. Civil service

[Fishheaddoobydoo]

Just found out 4(!)people have complained about me at work. I'm a line manager. None are my team apparently but I don't know much more.
One has mentioned bullying.
I'm not a union member. I've emailed the union in a hope they might represent me if I join. It's unlikely isn't it?
My manager told me tonight. It's formal because they are waiting for a decision maker to be appointed. I don't know anything about the allegations yet.
Im civil service
Ive changed username for this.

Managers are also supposed to make sure shit gets done.

@Fishheaddoobydoo if you can't think of possible reasons why then there probably isn't anything (reflect: were you abusive, insulting, unreasonable, unclear). As a new manager being taken advantage of by some of my team (I was so green and nervous) was told by someone very senior and successful, you've not really been a manager until someone has complained about you.

Yup, welcome to management op.
It will probably stand you in good stead for promotion. Don't worry about it.