Beyoncé fans have joined the rush to get tickets for her first solo tour for seven years, as the first pre-sale opened for her UK dates.
O2 customers were the first to have access at 10:00 GMT, but some reported problems with its app and website.
There will be further pre-sales on Friday and Monday.
Tickets for the pop superstar's five UK stadium shows in Cardiff, Edinburgh, Sunderland and London will then go on general sale on Tuesday.
When are the concerts?
The UK concerts are part of a 43-date world tour in support of her Grammy-nominated Renaissance album.
The shows kick off in Sweden on 10 May, before landing at Cardiff's Principality Stadium a week later.
She will then visit Edinburgh's Murrayfield on 20 May, Sunderland's Stadium of Light on 23 May and London's Tottenham Hotspur Stadium on 29 and 30 May.
Beyoncé has set the standard ticket prices at roughly the same level as her last stadium tour, with her husband Jay-Z in 2018, when entry started at £51.
However, the VIP packages, some of which included guaranteed front row seats, are more than four times that tour's top price of £475.
Many fans on social media ridiculed the cost, reminding Beyoncé that she'd advised people to "quit their jobs" on her recent single, Break My Soul.
Billboard magazine predicted the five-month tour could earn the star up to $275m (£223m).
What happened to the O2 website?
The phrase "O2 Priority" trended on Twitter after the company's app and website fell over ahead of Beyoncé's ticket sale.
Hundreds of fans were upset that they couldn't access the site, but others were more concerned that they'd missed out on a free coffee from Greggs.
In a statement, the company apologised "to anyone experiencing difficulties".
"Tickets are selling and we're seeing huge demand. We're doing everything we can behind the scenes to help keep the app running smoothly."
The O2 app and website also crashed when the company had pre-sale access for another major tour, for comedian Peter Kay, in November.