@newbie. I would advise you to tell your Employer. The law can and will protect you but only if you tell them. Our condition is so unpredictable that it would be unwise not to say anything. You don’t have to send an email to all staff saying “Hey everyone, guess what I’ve got”. Your HR manager would be sufficient. If you’re thinking of going on Ocrevus, you will need time off for your infusions and potentially time off afterwards to recover (personally, I only needed one day but everyone’s different).
I only tell people at work on a need to know basis because like you, my symptoms are mild but should you get cog fog or fatigue at work, they will know why (and understand).