As far as I know the Arcane background in Mage: The Ascension did not mention the ability to "suppress" the effect of Arcane (i.e. people being unable to track/remember the Mage in question). However, the Unofficial Wiki (link below) expressly states that it is possible.
At the risk of "Primarily Opinion Based" I am wondering if that suppression is momentary or long term?
If the Mage wants their friend to remember them when they meet for coffee. The Mage suppresses the effect ONCE for the duration of the coffee. The next time they meet, will the friend remember the Mage?
On the one hand it may be possible (with low levels of Arcane) to suppress it one time, thereby creating a "permanent" memory imprint, and not have to continue doing it for those individuals again and again (leave it "up" all the time).
Like an idiot I forgot the Wiki link -.- Mage: The Ascension glossary - Arcane