The phrase "additionally when you" is correct and usable in written English.
It can be used to introduce an extra point or detail that relates to a previous statement, particularly when addressing actions or conditions related to the reader.
Example: "Additionally, when you submit your application, please ensure that all required documents are included."
Alternatives: "furthermore when you" or "also when you".
Additionally, when you visit the loo, there's some weird mirror programme going on in there.
Additionally, when you actually see what the working conditions are in a particular location or how it feels to be on a 10pm scheduled conference call, you may recognize that concerns you had brushed off as minor are really legitimate problems you need to address.
Additionally, when you make your own juice, not all the fibre is stripped away, as soluble fibre remains and it also affects the way in which the sugar in the juice is absorbed into the bloodstream (having soluble fibre helps the body slow down the absorption of sugars).
Additionally, when you move the employer stock out of the retirement plan, you can no longer roll it to an IRA or other tax-advantaged retirement plan.
Additionally, when you add comments and contribute to group discussions, it will be displayed on the group discussion section and also appear on your status updates.
Additionally, when you go to the job website, you will see that some jobs are classified as 'work study' or 'ws'ws
Additionally, when talking to others you have to remember that you can't take back things you say, and people may forgive, but they often don't forget.
Additionally, when selecting a location, you should be in a safe area, and close to a large population of potential clientele.
Additionally, when they do take risks, you will likely respond positively, thus reinforcing their risk taking.
Additionally, when the pressure is on, you don't want to forget half of your communication or slip into old communication patterns by mistake.
Additionally, when prospective customers hear about you from more than one source, they tend to become more curious and more likely to check into your business.
