Why can't I use organization variables in a personal signature?
Missive currently doesn't support the use of organization variables in personal signatures.
To illustrate, let's say you belong to several organizations in Missive, and you hold different job titles in each one. Using the {{ user.job.title }}
variable would create a conflict when creating a personal signature. That's why we currently don't allow it.
Remember, a personal signature is meant for your individual use. Thus, you can easily create one without incorporating any variables. Alternatively, if you wish to include the same variables from an organization, it's also possible to apply an organization's managed signature to a private email account.
Learn more about managed signatures here.