[Can't sell stock from ISA account - 'order rejected' but WHY?]

Update: I was able to place limit order from my ISA account later that day from desktop browser.

Tips: When I used the app on my iPhone, the limit order worked every time I have tried, which is a relief.

[Can't sell stock from ISA account - 'order rejected' but WHY?]

It's really frustrating now. 

I can't sell Robinhood shares today, many times. I'm trying to place limit order very close the current price from my ISA account.

My trust is IG platform is fading. I used Interactive Investors, AJBell before, and never had such issues. 

Same as I couldn't Coinbase few days ago, I had reported as below:

 

[Orders from prorealtime rejected. "The market you have requested is no longer available online"]

"Order Rejected: The market you have requested is no longer available online"

I received the same error multiple times today, when placing limit sell order for Coinbase. I and my wife tried selling from two different ISA accounts but got same error in both account.

I wonder if it's just a technical glitch or any financial limitations/policies that's happening on the platform?

Hope it gets resolved quickly.