Ref. No. 37 / 1039
In the name of Allah the most Gracious the most Merciful
The answer to your question is hereunder:
In the above mentioned case it is allowable for you to use the nickname given by the company temporarily and your Iman isn’t in danger. So don’t worry about it.
And Allah knows best
Darul Ifta
Darul Uloom Waqf Deoband