Typically you will have trading windows when you’re legally allowed to trade a company where you have insider info. Violating this will get you into all kinds of legal trouble
Long story short: you’ll definitely know if you were a registered person, because you’ll have to take a quick training course. Since you haven’t, you’re not registered (registered = having access to confidential info that would give you unfair advantage over the public). So you can buy whatever asset you want from any trading platform you want.
You should honor trading blackout windows. Your employer's broker blocks trading during blackout days. Onus is on you to honor it on the other platforms
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That being said, it’s illegal to omit this information if you are restricted.