Can you make an acronym out of a name that incorporates the @ symbol? For instance, can "People@Work" be "P@W" in the body of the document once it has been spelled out?
These days the @ sign should probably be reserved for email addresses. Generally, when I make choices in this regard, I resist including anything other than letters in an acronym. So, for example, I recently suggested that N/A (for not applicable) be replaced with NA.
On the other hand, there are certain items that have a long history in the documents I deal with. For example, wt% is how we write "weight percent" an important unit for analysis. Lower case and the percent symbol, both being non-standard for acronyms.
So what you need to decide is, does this symbol represent a cultural issue that already exists in documents? If yes, then keep using it. If not, then try to stay tidy.