Unlike heterosexuals, analyzing the identity of a queer person could remain a peculiar task altogether, especially for the people who discern nothing about the queer community. In this modern scenario, people are coming forward and keeping efforts to know about every distinct aspect related to queer people and their identities. But some people easily judge others and conclude their assumptions by looking at others' appearances, which is a flawed approach and it may offend any queer person out there if you go extremely wrong in terms of identities.
This isn't for only heterosexuals, many queer people have no idea about other queer people, especially the non-binary people. Queer is an umbrella term for every person other than heterosexuals. Some queer people follow the gender binary and some won't. Hence, you need to keep a few things in mind while asking about any queer person's identity if you don't know and if you face trouble in getting them.
Remaining as a blank page and filling your brain with the inputs given by a queer person is a straightforward approach and all you need to do is to open your mouth and ask without hesitating or building up assumptions. No queer person denies explaining their identity to someone who directly approaches them in terms of understanding and getting along with them. Without complicating your question, ask them directly to make you know about their identities.
Don't carry a presumptuous mindset and barge into any queer person's life by spilling the identity you assumed regarding a particular person. That may make queer people feel a bit awkward. How do you feel if someone entitles you with the wrong identity even though you befit typical gender norms? You surely feel weird right! Apply the same rule to queer people too!
Pronouns are a bit complicated in the queer community, yes! But they aren't as difficult as rocket science to understand. Grammatically, you may feel hard to gather sentences or mention a queer person literally but after the inclusion of they/them as the pronouns for non-binary people, things became easier if you know how to substitute those pronouns in the place of he/him or she/her. Get along with the emotion, not the linguistic exception.
Regarding pronouns, some queer people prefer carrying different pronouns in different places. For instance, a bisexual male can be a drag queen. If being bisexual is his orientation then being a drag queen could be her profession. So, that particular queer person feels comfortable if you refer with pronouns he/him personally and she/her professionally. So while inquiring, please ask queer people regarding their preference of pronouns at the workplace and out of the workplace.