Hello everyone,
This is my first post here although I usually check the forum for my many questions about this country

! I looked for previous answers but did not find any and so here I am:
I am renting a room in an apartment with three other roommates. Two roommates are main tenants—my lease is a sublease with one of them (let's call him A).
If I want to sublet my room for three months, do I need to get the approval of A? Do I need the agreement of the other tenants in the apartment?
Thank you!