I tried it on my end, using NT 8.0.27.1 (no new login popup). The order, profit target and stop loss from the desktop immediately showed up on the Tradovate.com web platform. Not sure what you're doing wrong, but if you're using 8.1, try with 8.0.27.1 instead.
See screenshots below. The timeframes are different between the two, but notice the prices for each of the orders is the same between NT and tradovate web.
NT 8.0.27.1
Tradovate.com web platform:
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