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In many states in the US, you only need one party's consent. In the cases where you need dual party consent, they must explicitly ask you. Of course, that works both ways in each case. If you only need one party's consent, you can be that party and record. You don't even need to ask consent.

Also, you can opt out. Just ask them to stop recording. If they don't, hang up. But most companies will stop recording when asked.

It's not really about training. It is to provide evidence in court in case you try to sue the company.

It also motivates customers to behave in a civil manner because they know they are being recorded.

Let the first human who answers know that you are recording too, for quality assurance and training. Additionally, apologise. The call is important but the current high demand has made you slower than normal.